diff -up firefox-55.0/js/src/jit/MIR.h.old firefox-55.0/js/src/jit/MIR.h
--- firefox-55.0/js/src/jit/MIR.h.old	2017-08-08 14:04:44.528460099 +0200
+++ firefox-55.0/js/src/jit/MIR.h	2017-08-08 14:05:11.045364831 +0200
@@ -12434,7 +12434,7 @@ class MNearbyInt
     TRIVIAL_NEW_WRAPPERS
 
     static bool HasAssemblerSupport(RoundingMode mode) {
-        return Assembler::HasRoundInstruction(mode);
+        return false;
     }
 
     RoundingMode roundingMode() const { return roundingMode_; }
diff -up firefox-55.0/js/src/jit/ExecutableAllocator.h.old firefox-55.0/js/src/jit/ExecutableAllocator.h
--- firefox-55.0/js/src/jit/ExecutableAllocator.h.old	2017-08-09 09:24:18.784983505 +0200
+++ firefox-55.0/js/src/jit/ExecutableAllocator.h	2017-08-09 09:28:01.471100075 +0200
@@ -307,6 +307,10 @@ class ExecutableAllocator
     {
         sync_instruction_memory((caddr_t)code, size);
     }
+#else
+    static void cacheFlush(void*, size_t)
+    {
+    }
 #endif
 
   private:
diff -up firefox-55.0/js/src/wasm/WasmBuiltins.cpp.old firefox-55.0/js/src/wasm/WasmBuiltins.cpp
--- firefox-55.0/js/src/wasm/WasmBuiltins.cpp.old	2017-08-09 12:50:46.877450765 +0200
+++ firefox-55.0/js/src/wasm/WasmBuiltins.cpp	2017-08-09 12:50:59.725406974 +0200
@@ -881,7 +881,6 @@ wasm::EnsureBuiltinThunksInitialized()
     MOZ_ASSERT(!masm.numSymbolicAccesses());
 #endif
 
-    ExecutableAllocator::cacheFlush(thunks->codeBase, thunks->codeSize);
     if (!ExecutableAllocator::makeExecutable(thunks->codeBase, thunks->codeSize))
         return false;
 
diff -up firefox-55.0/js/src/wasm/WasmCode.cpp.old firefox-55.0/js/src/wasm/WasmCode.cpp
--- firefox-55.0/js/src/wasm/WasmCode.cpp.old	2017-08-09 12:50:37.205483731 +0200
+++ firefox-55.0/js/src/wasm/WasmCode.cpp	2017-08-09 12:51:10.365370708 +0200
@@ -287,8 +287,6 @@ CodeSegment::initialize(Tier tier,
     if (!StaticallyLink(*this, linkData))
         return false;
 
-    ExecutableAllocator::cacheFlush(bytes_.get(), RoundupCodeLength(codeLength));
-
     // Reprotect the whole region to avoid having separate RW and RX mappings.
     if (!ExecutableAllocator::makeExecutable(bytes_.get(), RoundupCodeLength(codeLength)))
         return false;
diff -up firefox-55.0/media/libyuv/libyuv/tools_libyuv/autoroller/unittests/testdata/DEPS.chromium.old firefox-55.0/media/libyuv/libyuv/tools_libyuv/autoroller/unittests/testdata/DEPS.chromium
diff -up firefox-55.0/media/webrtc/trunk/Makefile.old firefox-55.0/media/webrtc/trunk/Makefile