[YAML] fix output incorrect format for block scalar string

llvm/lib/Support/YAMLTraits.cpp

@@ -725,18 +725,18 @@ void Output::blockScalarString(StringRef &S) {
   if (!StateStack.empty())
     newLineCheck();
   output(" |");
-  outputNewLine();
 
   unsigned Indent = StateStack.empty() ? 1 : StateStack.size();
 
   auto Buffer = MemoryBuffer::getMemBuffer(S, "", false);
   for (line_iterator Lines(*Buffer, false); !Lines.is_at_end(); ++Lines) {
+    outputNewLine();
     for (unsigned I = 0; I < Indent; ++I) {
       output("  ");
     }
     output(*Lines);
-    outputNewLine();
   }
+  outputUpToEndOfLine("");
 }
 
 void Output::scalarTag(std::string &Tag) {

llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll

@@ -431,7 +431,6 @@ end:
 
 ; CHECK-LABEL: name: unreachable
 ; CHECK: G_ADD
-; CHECK-NEXT: {{^$}}
 ; CHECK-NEXT: ...
 define void @unreachable(i32 %a) {
   %sum = add i32 %a, %a

llvm/test/CodeGen/Generic/MIRStripDebug/no-metadata-present.mir

@@ -3,7 +3,6 @@
 # CHECK: name: test
 # CHECK: body: |
 # CHECK-NEXT: bb.0:
-# CHECK-EMPTY:
 # CHECK-NEXT: ...
 
 ---

llvm/test/CodeGen/MIR/AArch64/empty-MF.mir

@@ -3,7 +3,6 @@
 # CHECK-NEXT: ---
 # CHECK-NEXT: name:            foo
 # CHECK: body:             |
-# CHECK-EMPTY:
 # CHECK-NEXT: ...
 ---
 name: foo

llvm/test/tools/obj2yaml/Minidump/basic.yaml

@@ -114,7 +114,6 @@ Streams:
 # CHECK-NEXT:     Text:             |
 # CHECK-NEXT:       400d9000-400db000 r-xp 00000000 b3:04 227        /system/bin/app_process
 # CHECK-NEXT:       400db000-400dc000 r--p 00001000 b3:04 227        /system/bin/app_process
-# CHECK-EMPTY:
 # CHECK-NEXT:   - Type:            ModuleList
 # CHECK-NEXT:     Modules:
 # CHECK-NEXT:       - Base of Image:   0x1020304050607

llvm/unittests/Support/YAMLIOTest.cpp

@@ -1298,7 +1298,7 @@ TEST(YAMLIO, TestScalarAfterBlockScalar) {
 - block_scalac:     |
     AA
     BB
-scalar:          a
+  scalar:          a
 ...
 )");
 }