Add mips32 to LLVM configure's list of allowed Subzero targets.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=4167

Issue 1158093002 moved here to register under different
user email.

https://codereview.chromium.org/1158093002/

[email protected]

Review URL: https://codereview.chromium.org/1163713009

Patch from Reed Kotler <[email protected]>.

Author: Reed Kotler

autoconf/configure.ac

@@ -1230,6 +1230,7 @@ case "$enableval" in
         X8664)  SUBZERO_TARGETS_TO_BUILD="X8664 $SUBZERO_TARGETS_TO_BUILD" ;;
         ARM32)  SUBZERO_TARGETS_TO_BUILD="ARM32 $SUBZERO_TARGETS_TO_BUILD" ;;
         ARM64)  SUBZERO_TARGETS_TO_BUILD="ARM64 $SUBZERO_TARGETS_TO_BUILD" ;;
+        MIPS32) SUBZERO_TARGETS_TO_BUILD="MIPS32 $SUBZERO_TARGETS_TO_BUILD" ;;
         *) AC_MSG_ERROR([Unrecognized subzero target $a_target]) ;;
       esac
   done

configure

@@ -5785,6 +5785,7 @@ case "$enableval" in
         X8664)  SUBZERO_TARGETS_TO_BUILD="X8664 $SUBZERO_TARGETS_TO_BUILD" ;;
         ARM32)  SUBZERO_TARGETS_TO_BUILD="ARM32 $SUBZERO_TARGETS_TO_BUILD" ;;
         ARM64)  SUBZERO_TARGETS_TO_BUILD="ARM64 $SUBZERO_TARGETS_TO_BUILD" ;;
+        MIPS32) SUBZERO_TARGETS_TO_BUILD="MIPS32 $SUBZERO_TARGETS_TO_BUILD" ;;
         *) { { echo "$as_me:$LINENO: error: Unrecognized subzero target $a_target" >&5
 echo "$as_me: error: Unrecognized subzero target $a_target" >&2;}
    { (exit 1); exit 1; }; } ;;