Renames the assembler* files.

Renames the assembler* files to IceAssembler*. Fixes whatever breaks.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4077
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1179563004.
diff --git a/Makefile.standalone b/Makefile.standalone
index 82eff15..a641ce1 100644
--- a/Makefile.standalone
+++ b/Makefile.standalone
@@ -163,8 +163,8 @@
 SB_LDFLAGS := $(LINKOPTLEVEL) $(LD_EXTRA)
 
 SRCS = \
-	assembler.cpp \
-	assembler_ia32.cpp \
+	IceAssembler.cpp \
+	IceAssemblerX8632.cpp \
 	IceBrowserCompileServer.cpp \
 	IceCfg.cpp \
 	IceCfgNode.cpp \