aarch64: Fix typo and make rdma/rdm alias for FMV

gcc/ChangeLog:

	* config/aarch64/aarch64-option-extensions.def:
	Fix "rmd"->"rdm", and add FMV to "rdma".
	* config/aarch64/aarch64.cc (FEAT_RDMA): Define as FEAT_RDM.

Author: andrewcarlotti

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

@@ -117,9 +117,10 @@ AARCH64_OPT_FMV_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
 
 /* An explicit +rdma implies +simd, but +rdma+nosimd still enables scalar
    RDMA instructions.  */
-AARCH64_OPT_EXTENSION("rdma", RDMA, (), (SIMD), (), "asimdrdm")
+AARCH64_OPT_FMV_EXTENSION("rdma", RDMA, (), (SIMD), (), "asimdrdm")
 
-AARCH64_FMV_FEATURE("rmd", RDM, (RDMA))
+/* rdm is an alias for rdma.  */
+AARCH64_FMV_FEATURE("rdm", RDM, (RDMA))
 
 AARCH64_OPT_FMV_EXTENSION("crc", CRC, (), (), (), "crc32")
 

gcc/config/aarch64/aarch64.cc

@@ -19695,6 +19695,10 @@ typedef struct
 #define AARCH64_FMV_FEATURE(NAME, FEAT_NAME, C) \
   {NAME, 1ULL << FEAT_##FEAT_NAME, ::feature_deps::fmv_deps_##FEAT_NAME},
 
+/* The "rdma" alias uses a different FEAT_NAME to avoid a duplicate
+   feature_deps name.  */
+#define FEAT_RDMA FEAT_RDM
+
 /* FMV features are listed in priority order, to make it easier to sort target
    strings.  */
 static aarch64_fmv_feature_datum aarch64_fmv_feature_data[] = {