Bug 1432298 - Make sm-fuzzing build ready for libfuzzer. r=sfink

This patch disables the stdcxx-compat check for the sm-fuzzing build which
requires patching autospider as well. Furthermore, it switches the build
to linux64-clang-6-pre because the older clang 3.9 does not support trace-pc
instrumentation. Finally, it excludes fuzzing parts from the vanilla allocation
check.

MozReview-Commit-ID: FdhCIFdUore

--HG--
extra : rebase_source : c41bda01cb42f2ef0cd5a1675d88bdb55d9dc8c9

config/check_vanilla_allocations.py

@@ -139,6 +139,10 @@ def main():
         if "_memory_" in filename:
             continue
 
+        # Ignore the fuzzing code imported from m-c
+        if "Fuzzer" in filename:
+            continue
+
         fn = m.group(2)
         if filename == 'jsutil.o':
             jsutil_cpp.add(fn)

js/src/devtools/automation/autospider.py

@@ -276,7 +276,7 @@ else:
         CONFIGURE_ARGS += ' --target=x86_64-pc-mingw32 --host=x86_64-pc-mingw32'
 
 if platform.system() == 'Linux':
-    CONFIGURE_ARGS += ' --enable-stdcxx-compat'
+    CONFIGURE_ARGS = '--enable-stdcxx-compat ' + CONFIGURE_ARGS
 
 # Timeouts.
 ACTIVE_PROCESSES = set()

js/src/devtools/automation/variants/fuzzing

@@ -1,5 +1,5 @@
 {
-    "configure-args": "--enable-fuzzing --enable-debug-symbols='-gline-tables-only -gdwarf-2' --disable-jemalloc --enable-address-sanitizer --enable-ctypes --enable-nspr-build",
+    "configure-args": "--enable-fuzzing --enable-debug-symbols='-gline-tables-only -gdwarf-2' --disable-jemalloc --disable-stdcxx-compat --enable-address-sanitizer --enable-ctypes --enable-nspr-build",
     "optimize": true,
     "debug": false,
     "compiler": "clang",

taskcluster/ci/spidermonkey/linux.yml

@@ -169,3 +169,7 @@ sm-fuzzing-linux64/opt:
         symbol: SM(f)
     run:
         spidermonkey-variant: fuzzing
+    toolchains:
+        - linux64-clang-6-pre
+        - linux64-gcc
+        - linux64-rust