[RISCV][NFC] Use RISCVSubtarget method for predicate in RISCVFeatures…

….td when available

As RISCVSubtarget defines hasStdExtZfhOrZfhmin() and hasStdExtCOrZca(),
just use these for the matching Predicate definitions rather than
repeating the logic.

llvm/lib/Target/RISCV/RISCVFeatures.td

@@ -104,7 +104,7 @@ def HasStdExtZfh : Predicate<"Subtarget->hasStdExtZfh()">,
 def NoStdExtZfh : Predicate<"!Subtarget->hasStdExtZfh()">;
 
 def HasStdExtZfhOrZfhmin
-    : Predicate<"Subtarget->hasStdExtZfh() || Subtarget->hasStdExtZfhmin()">,
+    : Predicate<"Subtarget->hasStdExtZfhOrZfhmin()">,
                 AssemblerPredicate<(any_of FeatureStdExtZfh, FeatureStdExtZfhmin),
                                    "'Zfh' (Half-Precision Floating-Point) or "
                                    "'Zfhmin' (Half-Precision Floating-Point Minimal)">;
@@ -317,7 +317,7 @@ def FeatureStdExtZca
                        "floating point loads/stores)">;
 
 def HasStdExtCOrZca
-    : Predicate<"Subtarget->hasStdExtC() || Subtarget->hasStdExtZca()">,
+    : Predicate<"Subtarget->hasStdExtCOrZca()">,
                 AssemblerPredicate<(any_of FeatureStdExtC, FeatureStdExtZca),
                                    "'C' (Compressed Instructions) or "
                                    "'Zca' (part of the C extension, excluding "