Update llvm-emscripten

This updates emscripten to version 1.38.15, which is based on
LLVM 6.0.1.

Author: nikic

.gitmodules

@@ -43,7 +43,7 @@
 	url = https://github.com/rust-lang/rust-by-example.git
 [submodule "src/llvm-emscripten"]
 	path = src/llvm-emscripten
-	url = https://github.com/rust-lang/llvm.git
+	url = https://github.com/kripken/emscripten-fastcomp
 [submodule "src/stdsimd"]
 	path = src/stdsimd
 	url = https://github.com/rust-lang-nursery/stdsimd.git

src/bootstrap/compile.rs

@@ -736,7 +736,7 @@ pub fn build_codegen_backend(builder: &Builder,
 
             // Pass down configuration from the LLVM build into the build of
             // librustc_llvm and librustc_codegen_llvm.
-            if builder.is_rust_llvm(target) {
+            if builder.is_rust_llvm(target) && backend != "emscripten" {
                 cargo.env("LLVM_RUSTLLVM", "1");
             }
             cargo.env("LLVM_CONFIG", &llvm_config);

src/ci/docker/asmjs/Dockerfile

@@ -20,11 +20,11 @@ COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
 ENV PATH=$PATH:/emsdk-portable
-ENV PATH=$PATH:/emsdk-portable/clang/e1.37.13_64bit/
-ENV PATH=$PATH:/emsdk-portable/emscripten/1.37.13/
-ENV PATH=$PATH:/emsdk-portable/node/4.1.1_64bit/bin/
-ENV EMSCRIPTEN=/emsdk-portable/emscripten/1.37.13/
-ENV BINARYEN_ROOT=/emsdk-portable/clang/e1.37.13_64bit/binaryen/
+ENV PATH=$PATH:/emsdk-portable/clang/e1.38.15_64bit/
+ENV PATH=$PATH:/emsdk-portable/emscripten/1.38.15/
+ENV PATH=$PATH:/emsdk-portable/node/8.9.1_64bit/bin/
+ENV EMSCRIPTEN=/emsdk-portable/emscripten/1.38.15/
+ENV BINARYEN_ROOT=/emsdk-portable/clang/e1.38.15_64bit/binaryen/
 ENV EM_CONFIG=/emsdk-portable/.emscripten
 
 ENV TARGETS=asmjs-unknown-emscripten

src/ci/docker/scripts/emscripten.sh

@@ -33,8 +33,8 @@ curl -fL https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portab
 
 cd /emsdk-portable
 ./emsdk update
-hide_output ./emsdk install sdk-1.37.13-64bit
-./emsdk activate sdk-1.37.13-64bit
+hide_output ./emsdk install sdk-1.38.15-64bit
+./emsdk activate sdk-1.38.15-64bit
 
 # Compile and cache libc
 source ./emsdk_env.sh

src/llvm-emscripten

@@ -444,7 +444,7 @@ extern "C" void LLVMRustConfigurePassManagerBuilder(
     LLVMPassManagerBuilderRef PMBR, LLVMRustCodeGenOptLevel OptLevel,
     bool MergeFunctions, bool SLPVectorize, bool LoopVectorize, bool PrepareForThinLTO,
     const char* PGOGenPath, const char* PGOUsePath) {
-#if LLVM_RUSTLLVM
+#if LLVM_VERSION_GE(7, 0)
   unwrap(PMBR)->MergeFunctions = MergeFunctions;
 #endif
   unwrap(PMBR)->SLPVectorize = SLPVectorize;