[llvm] PowerPC32:PIC: Update to bcl to fix branch prediction mis-predict issue (PR #134140)

[Sean Fertile via llvm-commits]

================
@@ -18,8 +18,8 @@ entry:
 ; SMALL-LABEL: foo:
 ; SMALL:         stwu 1, -32(1)
 ; SMALL:         stw 30, 24(1)
-; SMALL-BSS:     bl _GLOBAL_OFFSET_TABLE_ at local-4
-; SMALL-SECURE:  bl .L0$pb
+; SMALL-BSS:     bcl 20, 31, _GLOBAL_OFFSET_TABLE_ at local-4
----------------
mandlebug wrote:

Agreed, IIUC the linker inserts a `blrl` at this address. So we branch and link to it, then return and link to get the pointer to the .got and the link stack should stay in sync.

https://github.com/llvm/llvm-project/pull/134140