[ORC][ORC-RT] Make WrapperFunctionCall::Create support void functions.

Serialized calls to void-wrapper-functions should have zero bytes of argument
data, but accessing ArgData[0] may (and will, in

[ORC][ORC-RT] Make WrapperFunctionCall::Create support void functions.

Serialized calls to void-wrapper-functions should have zero bytes of argument
data, but accessing ArgData[0] may (and will, in the case of SmallVector) fail
if the argument data buffer is empty.

This commit fixes the issue by adding a check for empty argument buffers.

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[ORC] Propagate out-of-band errors in callAsync.

Returned out-of-band errors should be wrapped as llvm::Errors and passed to the
SendDeserializedResult function. Failure to do this results in an ass

[ORC] Propagate out-of-band errors in callAsync.

Returned out-of-band errors should be wrapped as llvm::Errors and passed to the
SendDeserializedResult function. Failure to do this results in an assertion when
we try to deserialize from the WrapperFunctionResult while it's in the
out-of-band error state.

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[ORC] Rename ExecutorAddress to ExecutorAddr.

Removing the 'ess' suffix improves the ergonomics without sacrificing clarity.
Since this class is likely to be used more frequently in the future it's

[ORC] Rename ExecutorAddress to ExecutorAddr.

Removing the 'ess' suffix improves the ergonomics without sacrificing clarity.
Since this class is likely to be used more frequently in the future it's worth
some short term pain to fix this now.

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[ORC] Add MethodWrapperHandler utility for WrapperFunction.

MethodWrapperHandler removes some of the boilerplate when writing wrapper
functions to wrap method calls. It can be used as a handler for

[ORC] Add MethodWrapperHandler utility for WrapperFunction.

MethodWrapperHandler removes some of the boilerplate when writing wrapper
functions to wrap method calls. It can be used as a handler for wrapper
functions whose first argument is an ExecutorAddress: the address is cast to a
pointer of the given class type, then the given method function pointer is
called on that object pointer (passing the rest of the arguments).

E.g.

class MyClass {
public:
void myMethod(uint32_t, bool) { ... }
};

// SPS Method signature for myMethod -- note MyClass object address as first
// argument.
using SPSMyMethodWrapperSignature =
SPSTuple<SPSExecutorAddress, uint32_t, bool>;

// Wrapper function for myMethod.
WrapperFunctionResult
myMethodCallWrapper(const char *ArgData, size_t ArgSize) {
return WrapperFunction<SPSMyMethodWrapperSignature>::handle(
ArgData, ArgSize, makeMethodWrapperHandler(&MyClass::myMethod));
}

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[ORC] Add wrapper-function support methods to ExecutorProcessControl.

Adds support for both synchronous and asynchronous calls to wrapper functions
using SPS (Simple Packed Serialization). Also adds

[ORC] Add wrapper-function support methods to ExecutorProcessControl.

Adds support for both synchronous and asynchronous calls to wrapper functions
using SPS (Simple Packed Serialization). Also adds support for wrapping
functions on the JIT side in SPS-based wrappers that can be called from the
executor.

These new methods simplify calls between the JIT and Executor, and will be used
in upcoming ORC runtime patches to enable communication between ORC and the
runtime.

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[ORC] Fix missing function in unit test.

[ORC] Port WrapperFunctionUtils and SimplePackedSerialization from ORC runtime.

Replace the existing WrapperFunctionResult type in
llvm/include/ExecutionEngine/Orc/Shared/TargetProcessControlTypes.h

[ORC] Port WrapperFunctionUtils and SimplePackedSerialization from ORC runtime.

Replace the existing WrapperFunctionResult type in
llvm/include/ExecutionEngine/Orc/Shared/TargetProcessControlTypes.h with a
version adapted from the ORC runtime's implementation.

Also introduce the SimplePackedSerialization scheme (also adapted from the ORC
runtime's implementation) for wrapper functions to avoid manual serialization
and deserialization for calls to runtime functions involving common types.

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