Remove stale build script

[vmoroz]

Summary

Delete the unused .ado/scripts/build-hermesc-windows.js script.

The file was a Node.js port of the inline PowerShell logic in .github/workflows/build-hermesc-windows.yml (download ICU 64.2, copy MSVC runtime DLLs, configure with cmake -G "Visual Studio 17 2022" -Ax64, build the hermesc target, stage artifacts into win64-bin/). It appears to have been committed by accident — nothing ever called it:

• The matching workflow at .github/workflows/build-hermesc-windows.yml inlines the same PowerShell directly rather than invoking the script.
• No other workflow, CI task, build script, doc, or tool in the repo references build-hermesc-windows.js (verified via repo-wide grep).
• The script's history is three small commits (Add build script → Update script → Make code compile for Windows) with no follow-up wiring.

The mainline Windows build flow remains .ado/scripts/build.js, which is unaffected by this change.

Test Plan

• Verified via grep -r "build-hermesc-windows" that the only references in the repo are the workflow YAML (which inlines its own logic) and the deleted JS file itself.
• No build, test, or CI path exercises this file, so no behavioral validation is needed — the change is a pure file deletion.

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Benchmark Results

Total benchmarks: 102

v8

Benchmark (ms)	hermes (CI)
v8-crypto	604.6
v8-deltablue	752.2
v8-raytrace	128.8
v8-regexp	593
v8-richards	936.8
v8-splay	232.6

test-suites

Benchmark (ms)	hermes (CI)
box2d	3044
earley-boyer	3041.2
navier-stokes	6257
pdfjs	1022
gbemu	2297.2
code-load	6958.6
typescript	3419.2
simpleSum	9019.8
propAccess	2749.6
allocObj	255.4
allocObjLit	6479.4
allocNewObj	20819.6
allocArray	251
allocNewArray	34971.8
arrayRead	120.4
arrayReadByIndex	576.8
largeArrayRead	794.4
arrayWrite	253
largeArrayWrite	2160.8
interp-dispatch	2956.8
wb-perf	8224
arrayReverse	40.6
arrayMap	1441.6
arrayIndexOf	144.2
arrayLastIndexOf	156.6
arrayEvery	2172.4
arraySome	2184.2
arrayFill	2372.4
arrayFilter	1823.6
arrayFind	3196.6
arrayFindIndex	3215.4
arrayPop	1030.8
arrayReduce	1995.8
arrayReduceRight	1992.2
arrayShift	2049
arrayUnshift	2081.2
arrayIncludes	1216.8
arrayFrom	1113.4
arrayCopyWithin	1489.6
stringFromCharCode	93.8
arraySlice	793.2
arraySplice	26.8
arrayOf	1055.2
stringCharAt	1266.6
stringMatch	2858.6
stringSearch	2847.2
stringStartsWith	594
stringEndsWith	538.4
stringIncludes	1479
stringIndexOf	1483.6
stringLastIndexOf	1742.8
stringSplit	804.2
stringSlice	485.8
stringPadStart	2907.2
stringPadEnd	2905.8
regExpMatch	1497.6
regExpSearch	1219.8
regExpToString	1199.8
stringReplace	1362.2
regExpReplace	862.4
regExpFlags	925.4
regExpSplit	1322.2
numberArrayReadWrite	2399
protoCache	3535

micros

Benchmark (ms)	hermes (CI)
micros/getNodeById.js	5011
micros/setInsert.js	2601
micros/stringify-number.js	1813.6
micros/typed-array-sort.js	22359.4

jit-benches

Benchmark (ms)	hermes (CI)
jit-benches/idisp.js	2914.8
jit-benches/idispn.js	3379.6

many-subclasses

Benchmark (ms)	hermes (CI)
many-subclasses/many.js	19179.2
many-subclasses/many-sh-1.js	7749.4
many-subclasses/many-sh-2.js	7543.8
many-subclasses/many-sh-3.js	7127.8
many-subclasses/many-sh-4.js	7131.8

map-objects

Benchmark (ms)	hermes (CI)
map-objects/map-objects-untyped.js	1015.6
map-objects/map-objects-typed.js	954.8

map-strings

Benchmark (ms)	hermes (CI)
map-strings/map-strings-untyped.js	1186.8
map-strings/map-strings-typed.js	1140

nbody

Benchmark (ms)	hermes (CI)
nbody/original/nbody.js	846.4
nbody/fully-typed/nbody.js	707
nbody/fully-typed/nbody.ts	841.6

string-switch

Benchmark (ms)	hermes (CI)
string-switch/plain/bench.js	1310.8

raytracer

Benchmark (ms)	hermes (CI)
raytracer/original/bench-raytracer.js	1550.8
raytracer/original/raytracer.ts	1667.8

MiniReact

Benchmark (ms)	hermes (CI)
MiniReact/no-objects/out/simple-stripped.js	2233.6
MiniReact/no-objects/out/simple-lowered.js	2258.4
MiniReact/no-objects/out/music-stripped.js	40.8
MiniReact/no-objects/out/music-lowered.js	46.2
MiniReact/no-deps/stripped/MiniReact.js	5109.8
MiniReact/no-deps/MiniReact.js	5074.2
MiniReact/no-objects/out/simple.js	2227.8
MiniReact/no-objects/out/music.js	44.2

widgets

Benchmark (ms)	hermes (CI)
widgets/simple-classes/widgets.js	1750.6
widgets/original/es5/widgets.js	2759
widgets/single-file/es5/widgets.js	2757.4