CTFE pointer and destructor bugs 6933 7185 7187 7194

[donc]

6933 Segfault(declaration.c) using struct with destructor in CTFE
7185 [CTFE] ICE on changing char array length
7194 [CTFE] Incorrect behaviour with pointers as local struct variable

also regression bug 7187 was reopened because I'd missed a case; this fixes it so it can be closed again.

[WalterBright]

Fails on OSX with:

../dmd -m32 interpret
true
g
interpret.d(2114): Error: IveGotSwineFlu(Infection(SwineFlu(0,0)),0) is not a co
mpile-time boolean expression
interpret.d(2119): called from here: d.oink()
interpret.d(2133): called from here: quarantine()
interpret.d(2133): while evaluating: static assert(quarantine() == 10)
interpret.d(2125): Error: Mexico(Infection(SwineFlu(0,0)),2) is not a compile-ti
me boolean expression
interpret.d(2130): called from here: m.oink()
interpret.d(2134): called from here: mediafrenzy()
interpret.d(2134): while evaluating: static assert(mediafrenzy() == 2)
interpret.d(2208): Error: DelegStruct(5) is not a compile-time boolean expressio
n
interpret.d(2216): called from here: f(3)
interpret.d(2249): called from here: delegtest4()
interpret.d(2249): while evaluating: static assert(delegtest4() == 8)
interpret.d(2208): Error: DelegStruct(5) is not a compile-time boolean expressio
n
interpret.d(2228): called from here: w2u
interpret.d(2250): called from here: delegtest5()
interpret.d(2250): while evaluating: static assert(delegtest5() == 8)
interpret.d(2208): Error: DelegStruct(5) is not a compile-time boolean expressio
n
interpret.d(2243): called from here: k[1u].z(3)
interpret.d(2251): called from here: delegtest6()
interpret.d(2251): while evaluating: static assert(delegtest6() == 8)

--- errorlevel 256

[WalterBright]

The failure was for D1.

[WalterBright]

Reverted until D1 fix.