Fix the Wasm build cache (#159)

Follow-ups for https://github.com/paritytech/revive/pull/154
- Fix the cache in the Wasm build
- Remove a no longer needed script
- The Wasm build job uses parity-large

.github/trigger-wasm-llvm-build

@@ -1 +0,0 @@
-1

.github/workflows/build-revive-wasm.yml

@@ -9,12 +9,11 @@ on:
 env:
   CARGO_TERM_COLOR: always
   REVIVE_WASM_INSTALL_DIR: ${{ github.workspace }}/target/wasm32-unknown-emscripten/release
-  EMSCRIPTEN_VERSION: 3.1.64
   BUN_VERSION: 1.1.43
 
 jobs:
   build-revive-wasm:
-    runs-on: ubuntu-24.04
+    runs-on: parity-large
     defaults:
       run:
         shell: bash
@@ -26,30 +25,43 @@ jobs:
         uses: actions/cache@v3
         with:
           path: |
-            target-llvm
+            target-llvm/emscripten/target-final
+            target-llvm/gnu/target-final
           # Use a unique key based on LLVM version or configuration files to avoid cache invalidation
-          key: llvm-build-${{ runner.os }}-${{ hashFiles('LLVM.lock', '.github/trigger-wasm-llvm-build') }}
+          key: llvm-build-${{ runner.os }}-${{ hashFiles('LLVM.lock', 'Cargo.toml', 'Cargo.lock', 'crates/llvm-builder/**', '.github/workflows/build-revive-wasm.yml') }}
 
-      - name: Install Dependencies
+      - name: Install system dependencies
         run: |
-          # system dependencies
           sudo apt-get update && sudo apt-get install -y cmake ninja-build curl git libssl-dev pkg-config clang lld
-          rustup target add wasm32-unknown-emscripten
-          # host LLVM
-          curl -sSL --output llvm.tar.xz https://github.com/paritytech/revive/releases/download/v0.1.0-dev.7/clang+llvm-18.1.8-x86_64-linux-gnu-ubuntu-24.04.tar.xz
-          mkdir llvm18
-          tar Jxf llvm.tar.xz -C llvm18/
-          echo "LLVM_SYS_181_PREFIX=$(pwd)/llvm18" >> $GITHUB_ENV
-          # Clone LLVM and install the Emscripten SDK
+
+      - name: Install Rust stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          components: rust-src
+          target: wasm32-unknown-emscripten
+
+      - name: Install LLVM build dependencies
+        run: |
           make install-llvm-builder
           revive-llvm --target-env emscripten clone
 
+      - name: Setup revive environment variables
+        run: |
+          echo "LLVM_SYS_181_PREFIX=$(pwd)/target-llvm/gnu/target-final" >> $GITHUB_ENV
+          echo "REVIVE_LLVM_TARGET_PREFIX=$(pwd)/target-llvm/emscripten/target-final" >> $GITHUB_ENV
+
+      - name: Build host LLVM
+        if: steps.cache-llvm.outputs.cache-hit != 'true'
+        run: |
+          revive-llvm build
+
       - name: Build target LLVM
         if: steps.cache-llvm.outputs.cache-hit != 'true'
         run: |
           source emsdk/emsdk_env.sh
           revive-llvm --target-env emscripten build
-          echo "REVIVE_LLVM_TARGET_PREFIX=${PWD}/target-llvm/emscripten/target-final" >> $GITHUB_ENV
 
       - run: |
           rustup show

clone-llvm.sh

@@ -1,18 +0,0 @@
-#!/bin/bash
-
-set -euo pipefail
-
-# Default directory for cloning the llvm-project repository
-DEFAULT_DIR="llvm-project"
-
-# Check if a directory argument is provided
-if [ $# -eq 1 ]; then
-  DIR=$1
-else
-  DIR=$DEFAULT_DIR
-fi
-
-# Clone LLVM 18 (any revision after commit bd32aaa is supposed to work)
-if [ ! -d "${DIR}" ]; then
-  git clone --depth 1 --branch release/18.x https://github.com/llvm/llvm-project.git "${DIR}"
-fi