PR target/96759 - Handle global variable assignment from misaligned structure/PARALLEL return values.

In g:70cdb21e579191fe9f0f1d45e328908e59c0179e, DECL/global variable has handled
misaligned stores, but it didn't handle PARALLEL values, and I refer the
other part of this function, I found the PARALLEL need handled by
emit_group_* functions, so I add a check, and using emit_group_store if
storing a PARALLEL value, also checked this change didn't break the
testcase(gcc.target/arm/unaligned-argument-3.c) added by the orginal changes.

For riscv64 target, struct S {int a; double b;} will pack into a parallel
value to return and it has TImode when misaligned access is supported,
however TImode required 16-byte align, but it only 8-byte align, so it go to
the misaligned stores handling, then it will try to generate move
instruction from a PARALLEL value.

Tested on following target without introduced new reguression:
  - riscv32/riscv64 elf
  - x86_64-linux
  - arm-eabi

v2 changes:
  - Use maybe_emit_group_store instead of emit_group_store.
  - Remove push_temp_slots/pop_temp_slots, emit_group_store only require
    stack temp slot when dst is CONCAT or PARALLEL, however
    maybe_emit_group_store will always use REG for dst if needed.

gcc/ChangeLog:

	PR target/96759
	* expr.c (expand_assignment): Handle misaligned stores with PARALLEL
	value.

gcc/testsuite/ChangeLog:

	PR target/96759
	* g++.target/riscv/pr96759.C: New.
	* gcc.target/riscv/pr96759.c: New.

1 files changed, 2 insertions, 0 deletions

diff --git a/gcc/expr.c b/gcc/expr.c
index 1c79518..9d951e8 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -5168,6 +5168,8 @@ expand_assignment (tree to, tree from, bool nontemporal)
       rtx reg, mem;
 
       reg = expand_expr (from, NULL_RTX, VOIDmode, EXPAND_NORMAL);
+      /* Handle PARALLEL.  */
+      reg = maybe_emit_group_store (reg, TREE_TYPE (from));
       reg = force_not_mem (reg);
       mem = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_WRITE);
       if (TREE_CODE (to) == MEM_REF && REF_REVERSE_STORAGE_ORDER (to))