Subzero: Tweaks to reduce malloc use.

src/IceBrowserCompileServer.cpp

Index: src/IceBrowserCompileServer.cpp
diff --git a/src/IceBrowserCompileServer.cpp b/src/IceBrowserCompileServer.cpp
index 284a0c937523e34d99b9c38956f7714e2e4a2b42..30b3f2001e9d07f2133bfa2ea748eac12592d7c6 100644
--- a/src/IceBrowserCompileServer.cpp
+++ b/src/IceBrowserCompileServer.cpp
@@ -172,6 +172,13 @@ void BrowserCompileServer::getParsedFlags(uint32_t NumThreads, int argc,
   Flags->setUseSandboxing(true);
   Flags->setOutFileType(FT_Elf);
   Flags->setTargetArch(getTargetArch());
+  // Make the prefixes short to reduce the chance that string construction will
+  // have to resort to malloc().  Note that this won't change anything if the
+  // pexe was finalize with "--no-strip-syms".  TODO(stichnot): This will be
+  // unnecessary when we stop directly constructing strings that are used for
+  // names and lookup keys.
+  Flags->setDefaultFunctionPrefix("F");
+  Flags->setDefaultGlobalPrefix("G");
   ExtraFlags->setBuildOnRead(true);
   ExtraFlags->setInputFileFormat(llvm::PNaClFormat);
 }