[NFC][Options] Add same-address constraint to the description of '-m[no]ld-seq-sa' (llvm#141192)

Also, remove redundant "." in feature descriptions.

Author: Ami-zhang

clang/include/clang/Driver/Options.td

@@ -5526,9 +5526,9 @@ def mlamcas : Flag<["-"], "mlamcas">, Group<m_loongarch_Features_Group>,
 def mno_lamcas : Flag<["-"], "mno-lamcas">, Group<m_loongarch_Features_Group>,
   HelpText<"Disable amcas[_db].{b/h/w/d}">;
 def mld_seq_sa : Flag<["-"], "mld-seq-sa">, Group<m_loongarch_Features_Group>,
-  HelpText<"Do not generate load-load barrier instructions (dbar 0x700)">;
+  HelpText<"Do not generate same-address load-load barrier instructions (dbar 0x700)">;
 def mno_ld_seq_sa : Flag<["-"], "mno-ld-seq-sa">, Group<m_loongarch_Features_Group>,
-  HelpText<"Generate load-load barrier instructions (dbar 0x700)">;
+  HelpText<"Generate same-address load-load barrier instructions (dbar 0x700)">;
 def mdiv32 : Flag<["-"], "mdiv32">, Group<m_loongarch_Features_Group>,
   HelpText<"Use div.w[u] and mod.w[u] instructions with input not sign-extended.">;
 def mno_div32 : Flag<["-"], "mno-div32">, Group<m_loongarch_Features_Group>,

llvm/lib/Target/LoongArch/LoongArch.td

@@ -118,24 +118,24 @@ def FeatureRelax
 // Floating point approximation operation
 def FeatureFrecipe
     : SubtargetFeature<"frecipe", "HasFrecipe", "true",
-                       "Support frecipe.{s/d} and frsqrte.{s/d} instructions.">;
+                       "Support frecipe.{s/d} and frsqrte.{s/d} instructions">;
 def HasFrecipe : Predicate<"Subtarget->hasFrecipe()">;
 
 // Atomic memory swap and add instructions for byte and half word
 def FeatureLAM_BH
     : SubtargetFeature<"lam-bh", "HasLAM_BH", "true",
-                        "Support amswap[_db].{b/h} and amadd[_db].{b/h} instructions.">;
+                        "Support amswap[_db].{b/h} and amadd[_db].{b/h} instructions">;
 def HasLAM_BH : Predicate<"Subtarget->hasLAM_BH()">;
 
 // Atomic memory compare and swap instructions for byte, half word, word and double word
 def FeatureLAMCAS
     : SubtargetFeature<"lamcas", "HasLAMCAS", "true",
-                        "Support amcas[_db].{b/h/w/d}.">;
+                        "Support amcas[_db].{b/h/w/d}">;
 def HasLAMCAS : Predicate<"Subtarget->hasLAMCAS()">;
 
 def FeatureLD_SEQ_SA
     : SubtargetFeature<"ld-seq-sa", "HasLD_SEQ_SA", "true",
-                        "Don't use load-load barrier (dbar 0x700).">;
+                        "Don't use a same-address load-load barrier (dbar 0x700)">;
 def HasLD_SEQ_SA : Predicate<"Subtarget->hasLD_SEQ_SA()">;
 
 // Assume div.w[u] and mod.w[u] can handle inputs that are not sign-extended.