Give more detail in error message for unsupported ops in XlaCompiler.
Give more detail in error message for unsupported ops in XlaCompiler.

Explains option for enabling soft_device_placement if an Unsupported op
is encountered by XlaCompiler.

PiperOrigin-RevId: 328636713
Change-Id: I6913818d640902afe0695d05131534a064d3fb61

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