Fix: fix hidden global vars when merge in evaluator

[He1pa]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y 使用 oam 库，生成 oam 资源对象时，出现编译错误 #1810

2. What is the scope of this PR (e.g. component or file name):

kclvm/evaluator/src/lib.rs

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

[coveralls]

Pull Request Test Coverage Report for Build 12665341717

Details

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• 16 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.02%) to 70.682%

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Files with Coverage Reduction	New Missed Lines	%
kclvm/sema/src/advanced_resolver/node.rs	1	84.99%
kclvm/sema/src/core/symbol.rs	3	53.5%
kclvm/tools/src/LSP/src/state.rs	12	73.56%

Totals
Change from base Build 12654821010:	-0.02%
Covered Lines:	52844
Relevant Lines:	74763

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💛 - Coveralls

[zong-zhe]

LGTM