Inline memove for small constant sizes and refactor memcpy and memset.

Makefile.standalone

 # The following variables will likely need to be modified, depending on where
 # and how you built LLVM & Clang. They can be overridden in a command-line
 # invocation of make, like:
 #
 #   make LLVM_SRC_PATH=<path> LIBCXX_INSTALL_PATH=<path> CLANG_PATH=<path> \
 #        PNACL_BIN_PATH=<path> ...
 #
 
 # LLVM_SRC_PATH is the path to the root of the checked out source code. This
 # directory should contain the configure script, the include/ and lib/
@@ skipping 209 matching lines @@
 SB_OBJS=$(patsubst %.cpp, $(SB_OBJDIR)/%.o, $(SRCS))
 
 UNITTEST_SRCS = \
         BitcodeMunge.cpp \
         IceELFSectionTest.cpp \
         IceParseInstsTest.cpp
 
 # The X86 assembler tests take too long to compile. Given how infrequently the
 # assembler will change, we disable them.
 ifdef CHECK_X86_ASM
+ifndef DEBUG
+$(error Run check-unit with DEBUG=1 lest your machine perish)
+endif
   UNITTEST_SRCS += AssemblerX8632/LowLevel.cpp \
         AssemblerX8632/DataMov.cpp \
         AssemblerX8632/Locked.cpp \
         AssemblerX8632/GPRArith.cpp \
         AssemblerX8632/XmmArith.cpp \
         AssemblerX8632/ControlFlow.cpp \
         AssemblerX8632/Other.cpp \
         AssemblerX8632/X87.cpp \
         AssemblerX8664/LowLevel.cpp \
         AssemblerX8664/DataMov.cpp \
@@ skipping 147 matching lines @@
 
 docs:
         doxygen Doxyfile
         @echo See file://`pwd`/docs/html/index.html
 
 clean:
         rm -rf pnacl-sz *.o $(OBJDIR) $(SB_OBJDIR) build/pnacl-sz.bloat.json
 
 clean-all: clean
         rm -rf build/ docs/