lowercase error message

Author: Pierre-vh

llvm/test/TableGen/GlobalISelCombinerEmitter/pattern-errors.td

@@ -283,7 +283,7 @@ def matchdata_without_cxx_apply : GICombineRule<
   (match (G_ZEXT $dst, $src):$mi),
   (apply (G_MUL $dst, $src, $src))>;
 
-// CHECK: :[[@LINE+1]]:{{[0-9]+}}: error: Expected both a 'match' and 'apply' action in combine rule, or a single 'combine' action
+// CHECK: :[[@LINE+1]]:{{[0-9]+}}: error: expected both a 'match' and 'apply' action in combine rule, or a single 'combine' action
 def missing_apply : GICombineRule<
   (defs root:$dst),
   (match (G_ZEXT $dst, $src))>;
@@ -298,13 +298,13 @@ def combineop_missing_mir : GICombineRule<
   (defs root:$d),
   (combine "return APPLY;")>;
 
-// CHECK: :[[@LINE+1]]:{{[0-9]+}}: error: Expected both a 'match' and 'apply' action in combine rule, or a single 'combine' action
+// CHECK: :[[@LINE+1]]:{{[0-9]+}}: error: expected both a 'match' and 'apply' action in combine rule, or a single 'combine' action
 def mixed_combine_match : GICombineRule<
   (defs root:$d),
   (combine (G_ZEXT $d, $y), "return APPLY;"),
   (match (G_ZEXT $d, $y))>;
 
-// CHECK: :[[@LINE+1]]:{{[0-9]+}}: error: Expected both a 'match' and 'apply' action in combine rule, or a single 'combine' action
+// CHECK: :[[@LINE+1]]:{{[0-9]+}}: error: expected both a 'match' and 'apply' action in combine rule, or a single 'combine' action
 def mixed_combine_apply : GICombineRule<
   (defs root:$d),
   (combine "return APPLY;"),

llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp

@@ -833,7 +833,7 @@ bool CombineRuleBuilder::parseAll() {
       return false;
     }
   } else {
-    PrintError("Expected both a 'match' and 'apply' action in combine rule, "
+    PrintError("expected both a 'match' and 'apply' action in combine rule, "
                "or a single 'combine' action");
     return false;
   }