MATCH: Simplify `a rrotate (32-b) -> a lrotate b` [PR109906]

The pattern `a rrotate (32-b)` should be optimized to `a lrotate b`.
The same is also true for `a lrotate (32-b)`. It can be optimized to
`a rrotate b`.

This patch adds following patterns:
a rrotate (32-b) -> a lrotate b
a lrotate (32-b) -> a rrotate b

Bootstrapped and tested on x86_64-linux-gnu with no regressions.

	PR tree-optimization/109906

gcc/ChangeLog:

	* match.pd (a rrotate (32-b) -> a lrotate b): New pattern
	(a lrotate (32-b) -> a rrotate b): New pattern

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/pr109906.c: New test.

Signed-off-by: Eikansh Gupta <quic_eikagupt@quicinc.com>