Use x30 instead of lr which otherwise trip some versions of gcc

[torben-hansen]

Description of changes:

Cross-compiling with:

-- The C compiler identification is GNU 8.3.0
-- Check for working C compiler: /usr/xcc/aarch64-unknown-linux-gnueabi/bin/aarch64-unknown-linux-gnueabi-gcc

Resulted in:

Scanning dependencies of target bcm_hashunset
[  6%] Building ASM object crt/aws-lc/crypto/fipsmodule/CMakeFiles/bcm_hashunset.dir/bcm-delocated.S.o
bcm.c: Assembler messages:
bcm.c:15025: Error: operand 2 must be an integer register -- `stp x0,lr,[sp,#-16]!'
bcm.c:15028: Error: operand 2 must be an integer register -- `ldp x0,lr,[sp],#16'
bcm.c:15084: Error: operand 2 must be an integer register -- `stp x0,lr,[sp,#-16]!'
bcm.c:15087: Error: operand 2 must be an integer register -- `ldp x0,lr,[sp],#16'
bcm.c:18003: Error: operand 2 must be an integer register -- `stp x0,lr,[sp,#-16]!'
bcm.c:18006: Error: operand 2 must be an integer register -- `ldp x0,lr,[sp],#16'

Looks like a case of some versions of GCC not liking the link register notation lr being used instead of x30 where an integer register is expected for the instruction.

To recover, use x30 instead of lr in the delocator. Doesn't change behaviour.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.94%. Comparing base (7600809) to head (b4ce81f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1464   +/-   ##
=======================================
  Coverage   76.94%   76.94%           
=======================================
  Files         425      425           
  Lines       71587    71587           
=======================================
+ Hits        55080    55082    +2     
+ Misses      16507    16505    -2     

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