[GCC][PATCH][AArch64] Update hwcap string for fp16fml in aarch64-option-extensions.def

This is a minor patch that fixes the entry for the fp16fml feature in
GCC's aarch64-option-extensions.def.

As can be seen in the Linux sources here
https://github.com/torvalds/linux/blob/master/arch/arm64/kernel/cpuinfo.c#L69
the correct string is "asimdfhm", not "asimdfml".

Cross-compiled and tested on aarch64-none-linux-gnu.

2019-09-24  Stamatis Markianos-Wright  <stam.markianos-wright@arm.com>

	* config/aarch64/aarch64-option-extensions.def (fp16fml):
	Update hwcap string for fp16fml.

From-SVN: r276097

gcc/ChangeLog

+2019-09-24  Stamatis Markianos-Wright  <stam.markianos-wright@arm.com>
+
+	* config/aarch64/aarch64-option-extensions.def (fp16fml):
+	Update hwcap string for fp16fml.
+
 2019-09-24  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/91866

gcc/config/aarch64/aarch64-option-extensions.def

@@ -135,7 +135,7 @@ AARCH64_OPT_EXTENSION("sm4", AARCH64_FL_SM4, AARCH64_FL_SIMD, \
 /* Enabling "fp16fml" also enables "fp" and "fp16".
    Disabling "fp16fml" just disables "fp16fml".  */
 AARCH64_OPT_EXTENSION("fp16fml", AARCH64_FL_F16FML, \
-		      AARCH64_FL_FP | AARCH64_FL_F16, 0, false, "asimdfml")
+		      AARCH64_FL_FP | AARCH64_FL_F16, 0, false, "asimdfhm")
 
 /* Enabling "sve" also enables "fp16", "fp" and "simd".
    Disabling "sve" disables "sve", "sve2", "sve2-aes", "sve2-sha3", "sve2-sm4"