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Generate GAS output for Chromium

Upstream changes to account for differences in clang
syntax for Chromium iOS builds.

Since most of these are incompatible with XCode clang,
hide them behind a flag.

Change-Id: Idafcbcd4eb01b1ada6277da2d2edfd6c04b579fd

--- a/build/make/ads2gas_apple.pl

+++ b/build/make/ads2gas_apple.pl

@@ -17,6 +17,13 @@

 #

 # Usage: cat inputfile | perl ads2gas_apple.pl > outputfile

 #

+

+my $chromium = 0;

+

+foreach my $arg (@ARGV) {

+    $chromium = 1 if ($arg eq "-chromium");

+}

+

 print "@ This file was created from a .asm file\n";

 print "@  using the ads2gas_apple.pl script.\n\n";

 print "\t.set WIDE_REFERENCE, 0\n";

@@ -47,7 +54,7 @@

     s/@/,:/g;

     # Comment character

-    s/;/@/g;

+    s/;/ @/g;

     # Hexadecimal constants prefaced by 0x

     s/#&/#0x/g;

@@ -210,5 +217,19 @@

 #   s/\$/\\/g;                  # End macro definition

     s/MEND/.endm/;              # No need to tell it where to stop assembling

     next if /^\s*END\s*$/;

+

+    # Clang used by Chromium differs slightly from clang in XCode in what it

+    # will accept in the assembly.

+    if ($chromium) {

+        s/qsubaddx/qsax/i;

+        s/qaddsubx/qasx/i;

+        s/ldrneb/ldrbne/i;

+        s/ldrneh/ldrhne/i;

+        s/(vqshrun\.s16 .*, \#)0$/${1}8/i;

+

+        # http://llvm.org/bugs/show_bug.cgi?id=16022

+        s/\.include/#include/;

+    }

+

     print;

 }