Puck up changes from master to 2.065 branch

Four regression fixes:
[REG2.065a] Issue 12079 - Internal error: backend/cod4.c 358 for associative array access
[REG2.065a] Issue 12080 - Internal error: backend/symbol.c 1035 for invariant
[REG2.065a] Issue 12070 - Variant opCall not static
[REG2.065a] Issue 11824 - A stack variable escaping problem in CTFE Phobos code

One ICE fix:
Issue 11969 - ICE(statement.c) When mixing in a string literal containing errors

One diagnostic fix:
Pull 3212 - Remove repeated words in error message