[Logging] Bring back the stack size optimization

[junrushao]

This PR brings back the stack size optimization:

• [Logging] Reducing stack usage by moving dmlc::LogMessageFatal to the heap dmlc/dmlc-core#613
• [Logging] Add DMLC_NO_INLINE to LogMessageFatal dmlc/dmlc-core#615

It also brings back the error message showing those numbers used in comparison "(1 vs 2)" when CHECK_XX fails.

Some tricks:

• Make the transient object LogFatal an empty class, storing data on TLS so that it doesn't occupy stack space
• Forcefully disallow inlining on some functions that could potentially use stack space
• Replace the (slightly more) heavy-weighted "std::string" with "const char *" in the constructor of LogFatal

I tested the stack size in the following setting:

• Compiler: GCC 5.5
• OS: Ubuntu 18.04
• Function: tvm::relay::AutoSchedulerLayoutRewriter::VisitExpr_(const tvm::relay::CallNode*)
• CXX Flag: "-fstack-usage -g"

The stack usage drops from 1392 to 496 with the aforementioned tricks.

CC @comaniac @tkonolige @tqchen. Please let me know if it solves #7729. Thanks in advance!

[tqchen]

Thanks @junrushao1994 !