Add strx and all it's variants to FormsToPartition.

In DWARF 5, there are new string inderiction forms, which are strx,
strx1, strx2, strx3, and strx4. These forms do not deduplicate in the
CAS, and must be partitioned out when creating a CAS representation of
the debug info section. Therefore, they need to be added to the
FormsToPartition table. This patch addresses that.

(cherry picked from commit 2cdd722)

Author: rastogishubham

llvm/lib/MCCAS/MCCASDebugV1.cpp

@@ -218,6 +218,11 @@ bool mccasformats::v1::doesntDedup(dwarf::Form Form, dwarf::Attribute Attr) {
             dwarf::Attribute::DW_AT_call_file}},
           {dwarf::Form::DW_FORM_addrx, {}},
           {dwarf::Form::DW_FORM_addr, {}},
+          {dwarf::Form::DW_FORM_strx, {}},
+          {dwarf::Form::DW_FORM_strx1, {}},
+          {dwarf::Form::DW_FORM_strx2, {}},
+          {dwarf::Form::DW_FORM_strx3, {}},
+          {dwarf::Form::DW_FORM_strx4, {}},
       };
 
   auto it = FormsToPartition.find(Form);