[PATCH] Adding altmacro support in integrated assembler.

[michael zuckerman]

rebase in : 
This is the new review: http://reviews.llvm.org/D10692


================
Comment at: include/llvm/MC/MCParser/AsmLexer.h:58
@@ -57,1 +57,3 @@
 private:
+	/// isAtString check if the next token is <string> type or arithmetic.
+	/// string that begin with char '<' must to end with char '>' otherwise it is no a string. 
----------------
rafael wrote:
> Don't repeat name in comment.
accept

================
Comment at: lib/MC/MCParser/AsmLexer.cpp:427
@@ +426,3 @@
+				break;
+			if ((CurChar == ',') || (CurChar == '\n')){
+				CurPtr--;
----------------
rafael wrote:
> What is this for? Is <> delimited strings only valid if followed by , or newline?!
> 
for the <>I use the same output as the "" of llvm use empty string 
**example:** 
run: llvm-mc filename.asm  
.altmacro
.macro  mksym, name, number
    .long \name\number
	.long \name
.endm
mksym "",1
mksym <>,2
output
	.text





	.long	1





	.long	2

http://reviews.llvm.org/D10591

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