Add malloc/new profiling on linux

Makefile.standalone

Index: Makefile.standalone
diff --git a/Makefile.standalone b/Makefile.standalone
index 95f3093a2e4038221285a42f2035bac32ec67763..c9706459e07cabf69d8ae75888a20a0dc63a819d 100644
--- a/Makefile.standalone
+++ b/Makefile.standalone
@@ -152,6 +152,11 @@ else
   FORCEASM_LIT_TEST_EXCLUDES =
 endif
 
+ifdef LINUX_MALLOC_PROFILE

[Jim Stichnoth, 2016/03/12 00:12:57]

Update OBJDIR, something like:

  OBJDIR := $(OBJDIR)+MalProf

Otherwise "make" won't necessarily rebuild source files when you add
LINUX_MALLOC_PROFILE to the command line.

[sehr, 2016/03/15 00:36:45]

Done.

+  CXX_DEFINES += -DALLOW_LINUX_MALLOC_PROFILE=1

[Jim Stichnoth, 2016/03/12 00:12:58]

Can you update BASE_CXX_DEFINES instead of CXX_DEFINES?

[sehr, 2016/03/15 00:36:45]

Done.

+  LD_EXTRA += -Wl,--export-dynamic
+endif
+
 SB_OBJDIR := $(OBJDIR)+Sandboxed
 SBB_OBJDIR := $(OBJDIR)+SandboxedBrowser
 
@@ -290,6 +295,10 @@ ifndef MINIMAL
     IceTypeConverter.cpp
 endif
 
+ifdef LINUX_MALLOC_PROFILE
+  SRCS += LinuxMallocProfiling.cpp

[Jim Stichnoth, 2016/03/12 00:12:57]

I actually think this source file should be added to SRCS unconditionally, and
its entire contents should be wrapped in an #ifdef.  This is because the LLVM
build system does not use Makefile.standalone, instead it uses Makefile and
CMakeLists.txt.

Better yet, if it at least compiles on all platforms, use BuildDefs so the
compiler normally compiles it but optimizes it away.

[sehr, 2016/03/15 00:36:45]

I added the source unconditionally, and the bodies of the functions are empty
unless the flag is defined.

+endif
+
 OBJS=$(patsubst %.cpp, $(OBJDIR)/%.o, $(SRCS))
 SB_OBJS=$(patsubst %.cpp, $(SB_OBJDIR)/%.o, $(SRCS))
 SBB_OBJS=$(patsubst %.cpp, $(SBB_OBJDIR)/%.o, $(SRCS))