[AttrBuilder] Remove unused vscale accessors (NFC)

These accessors are not used. Generally, nowadays it is preferable
to perform queries on AttributeSets/Lists, rather than the
AttrBuilder, which is optimized towards attribute construction now.

Author: nikic

llvm/include/llvm/IR/Attributes.h

@@ -1146,12 +1146,6 @@ class AttrBuilder {
   /// doesn't exist, pair(0, 0) is returned.
   std::pair<unsigned, Optional<unsigned>> getAllocSizeArgs() const;
 
-  /// Retrieve the minimum value of 'vscale_range'.
-  unsigned getVScaleRangeMin() const;
-
-  /// Retrieve the maximum value of 'vscale_range' or None when unknown.
-  Optional<unsigned> getVScaleRangeMax() const;
-
   /// Add integer attribute with raw value (packed/encoded if necessary).
   AttrBuilder &addRawIntAttr(Attribute::AttrKind Kind, uint64_t Value);
 

llvm/lib/IR/Attributes.cpp

@@ -1653,14 +1653,6 @@ std::pair<unsigned, Optional<unsigned>> AttrBuilder::getAllocSizeArgs() const {
   return unpackAllocSizeArgs(getRawIntAttr(Attribute::AllocSize));
 }
 
-unsigned AttrBuilder::getVScaleRangeMin() const {
-  return unpackVScaleRangeArgs(getRawIntAttr(Attribute::VScaleRange)).first;
-}
-
-Optional<unsigned> AttrBuilder::getVScaleRangeMax() const {
-  return unpackVScaleRangeArgs(getRawIntAttr(Attribute::VScaleRange)).second;
-}
-
 AttrBuilder &AttrBuilder::addAlignmentAttr(MaybeAlign Align) {
   if (!Align)
     return *this;