Relax isPOD rules so ctors don't make structs non-POD
Issue 11503 - immutable return value from pure function implicitly converts to mutable.
Remove CallExp::implicitCastTo altogether.

The pure -> immutable case is checked in implicitConvTo as well,
and since it yields MATCHexact, the castTo() in
Expression::implicitCastTo is a no-op anyway.
Issue 11909 - Struct members and static arrays break pure function escape analysis (immutability violation).
Clarify traverseIndirections implementation.

No functional change intended.
Make traverseIndirections() return bool instead of int.
Explicitly cast off_t to size_t
fix Issue 12002 - Internal error: toir.c 181
Merge pull request #3159 from 9rnsr/fix12002

[REG] Issue 12002 - Internal error: toir.c 181
Merge pull request #3061 from ibuclaw/ctorpod

Relax isPOD rules so ctors don't make structs non-POD
Merge pull request #3085 from klickverbot/pure-return-immutable

pure -> immutable fixes
Merge pull request #3157 from yebblies/off_t

[DDMD] Explicitly cast off_t to size_t
Visual Studio build fixes (remove dump.c)
Merge pull request #3161 from CyberShadow/vs-20140127

Visual Studio build fixes (remove dump.c)
Mangle long and ulong correctly on 64-bit linux/osx
Hack around vtable emission problems
XXX Hack around Array param + debug info
Clean up some more troublesome comments