[RISCV] Remove period from Zvbb extension description.

No other instruction extension has a period.

There are also periods in 'ssaia' and 'smaia', but those descriptions
need a different update.

Author: topperc

llvm/lib/Target/RISCV/RISCVFeatures.td

@@ -569,11 +569,11 @@ def HasStdExtZvkb : Predicate<"Subtarget->hasStdExtZvkb()">,
 
 def FeatureStdExtZvbb
     : SubtargetFeature<"zvbb", "HasStdExtZvbb", "true",
-                       "'Zvbb' (Vector basic bit-manipulation instructions.)",
+                       "'Zvbb' (Vector basic bit-manipulation instructions)",
                        [FeatureStdExtZvkb]>;
 def HasStdExtZvbb : Predicate<"Subtarget->hasStdExtZvbb()">,
                               AssemblerPredicate<(all_of FeatureStdExtZvbb),
-                              "'Zvbb' (Vector basic bit-manipulation instructions.)">;
+                              "'Zvbb' (Vector basic bit-manipulation instructions)">;
 
 def FeatureStdExtZvbc
     : SubtargetFeature<"zvbc", "HasStdExtZvbc", "true",

llvm/test/MC/RISCV/rvv/zvbb.s

@@ -11,41 +11,41 @@
 vbrev.v v10, v9, v0.t
 # CHECK-INST: vbrev.v v10, v9, v0.t
 # CHECK-ENCODING: [0x57,0x25,0x95,0x48]
-# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions.){{$}}
+# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions){{$}}
 # CHECK-UNKNOWN: 57 25 95 48   <unknown>
 
 vclz.v v10, v9, v0.t
 # CHECK-INST: vclz.v v10, v9, v0.t
 # CHECK-ENCODING: [0x57,0x25,0x96,0x48]
-# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions.){{$}}
+# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions){{$}}
 # CHECK-UNKNOWN: 57 25 96 48   <unknown>
 
 vcpop.v v10, v9, v0.t
 # CHECK-INST: vcpop.v v10, v9, v0.t
 # CHECK-ENCODING: [0x57,0x25,0x97,0x48]
-# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions.){{$}}
+# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions){{$}}
 # CHECK-UNKNOWN: 57 25 97 48   <unknown>
 
 vctz.v v10, v9, v0.t
 # CHECK-INST: vctz.v v10, v9, v0.t
 # CHECK-ENCODING: [0x57,0xa5,0x96,0x48]
-# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions.){{$}}
+# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions){{$}}
 # CHECK-UNKNOWN: 57 a5 96 48   <unknown>
 
 vwsll.vv v10, v9, v8, v0.t
 # CHECK-INST: vwsll.vv v10, v9, v8, v0.t
 # CHECK-ENCODING: [0x57,0x05,0x94,0xd4]
-# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions.){{$}}
+# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions){{$}}
 # CHECK-UNKNOWN: 57 05 94 d4   <unknown>
 
 vwsll.vx v10, v9, a0, v0.t
 # CHECK-INST: vwsll.vx v10, v9, a0, v0.t
 # CHECK-ENCODING: [0x57,0x45,0x95,0xd4]
-# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions.){{$}}
+# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions){{$}}
 # CHECK-UNKNOWN: 57 45 95 d4   <unknown>
 
 vwsll.vi v10, v9, 29, v0.t
 # CHECK-INST: vwsll.vi v10, v9, 29, v0.t
 # CHECK-ENCODING: [0x57,0xb5,0x9e,0xd4]
-# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions.){{$}}
+# CHECK-ERROR: instruction requires the following: 'Zvbb' (Vector basic bit-manipulation instructions){{$}}
 # CHECK-UNKNOWN: 57 b5 9e d4   <unknown>