Missing setting disposed to true
Missing Args checks.
[xlinq] fix bug #23318 - XComment.ToString() accepts "invalid" values.

Before it passes the value to XmlWriter.WriteComment(), it replaces
invalid values to valid form.
Move llvm_init_inner inside #ifdef ENABLE_LLVM

This should fix c30a3e46d2f94682b4ec1cac42b7c7ddb0a39059 failing to link properly with ld 2.22 and GCC 4.9.1, on Linux, with non-LLVM builds.

./.libs/libmini.a(libmini_la-mini.o): In function `llvm_init_inner':
mini.c:(.text+0x1182b): undefined reference to `mono_llvm_init'
/usr/bin/ld: .libs/libmonoboehm-2.0.so.1.0.0: hidden symbol `mono_llvm_init' isn't defined
/usr/bin/ld: final link failed: Bad value
[mcs] More tweaks to conditional tokenizer. Fixes #23319
Added support for cross-compiling to x86 Linux/Android.
Fixed TLS detection to check for TARGET_MACH instead of __APPLE__.

In the case of cross-compiling to x86 Linux from OSX we'd hit compilation issues here.
UriParserTest.GetComponents_Ftp2 now uses the variable 'ftp2'.
[System] Fix most warnings on the System test suite
[System.Net] Add support for .pac proxy config scripts on mac
Merge pull request #1304 from slluis/mac-proxy-autoconfig

[System.Net] Add support for .pac proxy config scripts on mac
[sgen] Add major concurrent collector stw time to "Major GC time" counter
[sgen] Add concurrent collector counter for time spent during concurrent phase
[sgen] Don't get time twice at the same time.
Test Rss20ItemFormatter.ReadFrom Guid. Covers 23262.
Rss20ItemFormatter.ReadFrom now sets Id when guid is PermaLink.
Fixes 23262.
Merge pull request #1307 from esdrubal/servicemodelrss

Rss20ItemFormatter.ReadFrom now sets Id when guid is PermaLink.
Test Json deserialization of a floating-point number as object.
Covers 21583.
Improved Json deserialization of floating-point numbers.
When DataContractJsonSerializer was created from type object, deserialization of floating.point numbers was not possible.
Fixes 21583.
Merge pull request #1309 from esdrubal/json

Improved Json deserialization of floating-point numbers.