update llvm to 18.1.3 and emscripten to 3.1.54 (#2595)

Author: yowl

eng/pipelines/runtimelab/install-emscripten.ps1

@@ -13,11 +13,11 @@ git clone https://github.com/emscripten-core/emsdk.git
 Set-Location -Path emsdk
 
 # Checkout a specific commit to avoid unexpected issues
-git checkout 37b85e9
+git checkout c18280c
 
-./emsdk install 3.1.47
+./emsdk install 3.1.54
 
-./emsdk activate 3.1.47
+./emsdk activate 3.1.54
 
 # Set a variable for later use (used in common/build.ps1)
 Write-Host "##vso[task.setvariable variable=NATIVEAOT_CI_WASM_BUILD_EMSDK_PATH]$PWD"

eng/pipelines/runtimelab/install-llvm.ps1

@@ -32,7 +32,7 @@ if (!(gcm cmake -ErrorAction SilentlyContinue))
 
 if (!$NoClone)
 {
-    $LlvmProjectTag = "llvmorg-17.0.4"
+    $LlvmProjectTag = "llvmorg-18.1.3"
     $DepthOption = if ($CI) {"--depth","1"} else {}
     git clone https://github.com/llvm/llvm-project --branch $LlvmProjectTag $DepthOption
 }