[Hexagon] Standardize pseudo-instructions for calls and returns

- CALLv3nr        PS_call_nr
- CALLRv3nr       PS_callr_nr
- CALLstk         PS_call_stk

- TCRETURNi       PS_tailcall_i
- TCRETURNr       PS_tailcall_r

- JMPret          PS_jmpret
- JMPrett         PS_jmprett
- JMPretf         PS_jmpretf
- JMPrettnew      PS_jmprettnew
- JMPretfnew      PS_jmpretfnew
- JMPrettnewpt    PS_jmprettnewpt
- JMPretfnewpt    PS_jmpretfnewpt

llvm-svn: 278499