RISC-V: Minimal support of ZC extensions.

Author: Claudiu Zissulescu

bfd/elfxx-riscv.c

@@ -1211,8 +1211,10 @@ static struct riscv_implicit_subset riscv_implicit_subsets[] =
 
   {"zcb", "+zca", check_implicit_always},
   {"zcd", "+d,+zca", check_implicit_always},
+  {"zce", "+zca,+zcb,+zcf,+zcmp,+zcmt", check_implicit_always},
   {"zcf", "+f,+zca", check_implicit_always},
   {"zcmp", "+zca", check_implicit_always},
+  {"zcmt", "+zca", check_implicit_always},
 
   {"shcounterenw", "+h", check_implicit_always},
   {"shgatpa", "+h", check_implicit_always},
@@ -1418,9 +1420,11 @@ static struct riscv_supported_ext riscv_supported_std_z_ext[] =
   {"ztso",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zca",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zcb",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
+  {"zce",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zcf",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zcd",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zcmp",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
+  {"zcmt",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {NULL, 0, 0, 0, 0}
 };