[libc] Add a simple StringStream class.

This class will be used in future changes to construct simple strings.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D130334

[libc] Add a convenience class and function for integer to string conversion.

Printf's integer converter has been modified to use the new converter. In
future, it will be used to implement other par

[libc] Add a convenience class and function for integer to string conversion.

Printf's integer converter has been modified to use the new converter. In
future, it will be used to implement other parts of the libc.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D130227

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[libc] Add a method `find_last_of` to StringView.

Reviewed By: jeffbailey

Differential Revision: https://reviews.llvm.org/D130112

[libc] Fix API for remove_{prefix, suffix}

The API in StringView.h for remove_prefix was incorrect and was returning a
new StringView rather than just altering the view.

As part of this, also remov

[libc] Fix API for remove_{prefix, suffix}

The API in StringView.h for remove_prefix was incorrect and was returning a
new StringView rather than just altering the view.

As part of this, also removed some of the safety features. The comment
correctly noted that the behaviour is undefined in some cases,
but the code and test cases checked for that.

One caller was relying on the old behaviour, so fixed it and added some
comments.

Tested:
check-libc
llvmlibc
libc-loader-tests

Reviewed By: gchatelet

Differential Revision: https://reviews.llvm.org/D129950

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