[StackMaps] Remove format version from the class name [NFC]

Motivation is to reduce silly diffs when we change the format.  For instance, this causes most of D59020 to disappear.

llvm-svn: 358322
diff --git a/llvm/tools/llvm-readobj/COFFDumper.cpp b/llvm/tools/llvm-readobj/COFFDumper.cpp
index 334203c..8685340 100644
--- a/llvm/tools/llvm-readobj/COFFDumper.cpp
+++ b/llvm/tools/llvm-readobj/COFFDumper.cpp
@@ -1867,10 +1867,10 @@
 
   if (Obj->isLittleEndian())
     prettyPrintStackMap(
-        W, StackMapV2Parser<support::little>(StackMapContentsArray));
+        W, StackMapParser<support::little>(StackMapContentsArray));
   else
     prettyPrintStackMap(W,
-                        StackMapV2Parser<support::big>(StackMapContentsArray));
+                        StackMapParser<support::big>(StackMapContentsArray));
 }
 
 void COFFDumper::printAddrsig() {
diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index 06092b1..2cf2496 100644
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -2407,7 +2407,7 @@
       unwrapOrError(Obj->getSectionContents(StackMapSection));
 
   prettyPrintStackMap(
-      W, StackMapV2Parser<ELFT::TargetEndianness>(StackMapContentsArray));
+      W, StackMapParser<ELFT::TargetEndianness>(StackMapContentsArray));
 }
 
 template <class ELFT> void ELFDumper<ELFT>::printGroupSections() {
diff --git a/llvm/tools/llvm-readobj/MachODumper.cpp b/llvm/tools/llvm-readobj/MachODumper.cpp
index 07f9c63..62f41e0 100644
--- a/llvm/tools/llvm-readobj/MachODumper.cpp
+++ b/llvm/tools/llvm-readobj/MachODumper.cpp
@@ -667,10 +667,10 @@
 
   if (Obj->isLittleEndian())
     prettyPrintStackMap(
-        W, StackMapV2Parser<support::little>(StackMapContentsArray));
+        W, StackMapParser<support::little>(StackMapContentsArray));
   else
     prettyPrintStackMap(W,
-                        StackMapV2Parser<support::big>(StackMapContentsArray));
+                        StackMapParser<support::big>(StackMapContentsArray));
 }
 
 void MachODumper::printNeededLibraries() {