Use an alloc function for Token freelist instead of operator new.
Fix Issue 12820 - DMD can inline calls to functions that use alloca, allocating the memory in the caller function instead.
Merge pull request #3808 from yebblies/tokalloc

[DDMD] Use an alloc function for Token freelist instead of operator new.
Merge pull request #3811 from yebblies/issue3918

Issue 12820 - DMD can inline calls to functions that use alloca, allocating the memory in the caller function instead.
fix Issue 13179 - AA key type TagIndex now requires equality rather than comparison
Copying scope object should fill filedinit to NULL, due to avoid issue 11777
Merge pull request #3816 from 9rnsr/fix_sc

Copying scope object should fill filedinit to NULL, due to avoid issue 11777
Merge pull request #3813 from WalterBright/revert3731

[reg] fix Issue 13179 - AA key type TagIndex now requires equality rather than...
fix Issue 13208 - [ICE](e2ir.c 2077) with array operation
Merge pull request #3818 from 9rnsr/fix13208

[REG2.065] Issue 13208 - [ICE](e2ir.c 2077) with array operation
fix Issue 12242 - conflict error with public imports
[Refactoring] Add ScopeDsymbol::mergeOverloadSet
fix
Issue 13193 - Extreme slowdown in compilation time of OpenSSL in Tango for optimized build
Merge pull request #3819 from WalterBright/fix13193

[reg] fix Issue 13193 - Extreme slowdown in compilation time of OpenSSL in Tango for optimized build
fix Issue 13219 - segmentation fault in FuncDeclaration::getLevel
Merge pull request #3820 from 9rnsr/fix13219

[REG2.065] Issue 13219 - segmentation fault in FuncDeclaration::getLevel
Fix independent FE compilation: toSymbol remainings

Dsymbol::toSymbol was refactored into a visitor in commit
63e61f160784649cf2cbd1267aaf26e2a2468e73, but its traces
in gluestub.c remained.
Fix independent FE compilation: asmSemantic

AsmStatement::semantic was moved into a free function in commit
e1491c1f6911f095f4434f5a25e68e9330f52bde, but gluestub.c was
not correspondingly updated.
Fix independent FE compilation: buildClosure and retStyle

Both functions were turned into free functions in commit
022c70d12abee1bf9e1789567411ccd447160d62. Since there are
backend dependencies in toir.c, the patch add stubs in
gluestub.c.
Fix independent FE compilation: genhelpers

genhelpers was added to Module in commit
6d1882663b51dd72edeb62d78f2b23739713c3d5,
but not to gluestub.c.