Add four benchmarks from JetStream 3: richards, quicksort, hashset, gcc-loops.

These benchmarks are included in [JetStream], which is nominally a
browser JavaScript benchmark but which in recent times has started to
include JS+Wasm benchmarks. I picked several of the Wasm benchmarks that
are entirely or almost entirely in Wasm, with only the barest of JS
wrappers, and tweaked them to build on WASI instead. Then I added the
Sightglass-specific benchmark begin/end hook calls.

The original source files for these benchmarks remain under their
original licenses. A license exception for inclusion of files under
licenses other than `Apache-2.0 WITH LLVM-exception` (the BA's default
license) was granted by the Bytecode Alliance board [here], and all
files added in this PR are under `benchmarks/` and thus fit within that
exception.

[JetStream]: https://github.com/webkit/jetstream
[here]: bytecodealliance/governance#137

Author: cfallin

benchmarks/all.suite

@@ -118,3 +118,7 @@ shootout/shootout-xblabla20.wasm
 shootout/shootout-xchacha20.wasm
 spidermonkey/benchmark.wasm
 tract-onnx-image-classification/benchmark.wasm
+richards/benchmark.wasm
+gcc-loops/benchmark.wasm
+quicksort/benchmark.wasm
+hashset/benchmark.wasm

benchmarks/gcc-loops/Dockerfile

@@ -0,0 +1,34 @@
+# This two-phase Dockerfile allows us to avoid re-downloading APT packages and wasi-sdk with every
+# build.
+
+# First, retrieve wasi-sdk:
+
+FROM ubuntu:24.04 AS builder
+WORKDIR /
+RUN apt update && apt install -y wget
+
+# Download and extract wasi-sdk.
+RUN wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-28/wasi-sdk-28.0-x86_64-linux.tar.gz
+RUN tar xvf wasi-sdk-28.0-x86_64-linux.tar.gz
+
+# Second, compile the benchmark to Wasm.
+
+FROM ubuntu:24.04
+WORKDIR /
+COPY --from=builder /wasi-sdk-28.0-x86_64-linux /wasi-sdk/
+
+# Set common env vars.
+ENV CC=/wasi-sdk/bin/clang
+ENV CXX=/wasi-sdk/bin/clang++
+ENV LD=/wasi-sdk/bin/lld
+ENV CFLAGS=--sysroot=/wasi-sdk/share/wasi-sysroot
+ENV CXXFLAGS=--sysroot=/wasi-sdk/share/wasi-sysroot
+ENV PATH /wasi-sdk
+
+# Compile `benchmark.c` to `./benchmark.wasm`.
+COPY gcc-loops.cpp .
+COPY sightglass.h .
+WORKDIR /benchmark
+RUN $CXX $CXXFLAGS ../gcc-loops.cpp -O3 -fno-exceptions -g -I.. -o benchmark.wasm
+# We output the Wasm file to the `/benchmark` directory, where the client
+# expects it.

benchmarks/gcc-loops/benchmark.wasm

@@ -0,0 +1 @@
+Results: (1e2fdc4e): ed7aa26a b9b28d5b 67808d19 b4412829 132bc4c6 132bc4c6 b4412829 eb3492a9 7e51915b 0 61ffda0c f95b0406 495fecb4 ab6b4a02 a1d16823 bdaa178a 0 67808d19