[SPIR-V] Add pre-commit CI workflow

Add a pre-commit CI workflow for the experimental SPIR-V backend. This
action should only run when SPIR-V target or test files are modified.
The `codegen-spirv` tests don't run as part of `check-all` because the
SPIR-V backend is still experimental.

Depends on #73371 (for a green tree)

Author: sudonatalie

.github/workflows/llvm-project-tests.yml

@@ -10,6 +10,8 @@ on:
         required: false
       projects:
         required: false
+      experimental_targets:
+        required: false
   workflow_call:
     inputs:
       build_target:
@@ -20,6 +22,10 @@ on:
         required: true
         type: string
 
+      experimental_targets:
+        required: false
+        type: string
+
 concurrency:
   # Skip intermediate builds: always.
   # Cancel intermediate builds: only if it is a pull request build.
@@ -85,7 +91,7 @@ jobs:
           # This should be a no-op for non-mac OSes
           PKG_CONFIG_PATH: /usr/local/Homebrew/Library/Homebrew/os/mac/pkgconfig//12
         with:
-          cmake_args: '-GNinja -DLLVM_ENABLE_PROJECTS="${{ inputs.projects }}" -DCMAKE_BUILD_TYPE=Release -DLLDB_INCLUDE_TESTS=OFF -DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_COMPILER_LAUNCHER=sccache'
+          cmake_args: '-GNinja -DLLVM_ENABLE_PROJECTS="${{ inputs.projects }}" -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="${{ inputs.experimental_targets }}" -DCMAKE_BUILD_TYPE=Release -DLLDB_INCLUDE_TESTS=OFF -DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_COMPILER_LAUNCHER=sccache'
           build_target: '${{ inputs.build_target }}'
 
       - name: Build and Test libclc

.github/workflows/spirv-tests.yml

@@ -0,0 +1,28 @@
+name: SPIR-V Tests
+
+permissions:
+  contents: read
+
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - 'llvm/lib/Target/SPIRV/**'
+      - 'llvm/test/CodeGen/SPIRV/**'
+      - '.github/workflows/spirv-tests.yml'
+
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+jobs:
+  check_spirv:
+    if: github.repository_owner == 'llvm'
+    name: Test SPIR-V
+    uses: ./.github/workflows/llvm-project-tests.yml
+    with:
+      build_target: check-llvm-codegen-spirv
+      projects: clang
+      experimental_targets: SPIRV