Fix some bugs in SymFloat IValue and toPyObject handling

[ezyang]

Stack from ghstack (oldest at bottom):

• Symintified all functions, not including factory functions #86078
• Teach remove_symint to handle OptionalSymIntArrayRef #86088
• Correct ownership of OptionalSymIntArrayRef in backwards #86087
• Allow functionalize_aten_op to work with non-SymInt signature. #86080
• Fix type of as_float_unchecked #86075
• -> Fix some bugs in SymFloat IValue and toPyObject handling #86072

• Test for symbolic cases first before non-symbolic, as symbolic
  ints/floats advertise as being ints/floats
• Add missing case for toPyObject

Signed-off-by: Edward Z. Yang ezyang@fb.com

[pytorch-bot]

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❌ 3 Failures

As of commit 80d44b3:

The following jobs have failed:

• linux-bionic-py3_7-clang8-xla / test (xla, 1, 1, linux.2xlarge)
• macos-12-py3-arm64 / test (default, 1, 2, macos-m1-12)
• macos-12-py3-arm64 / test (default, 2, 2, macos-m1-12)

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