Fix quadratic runtime for duplicate export name detection #6585
| Job | Run time |
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| 4m 28s | |
| 4m 28s | |
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| 4m 28s | |
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| 4m 27s | |
| 4m 28s | |
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| 4m 36s | |
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| 4m 32s | |
| 4m 31s | |
| 4m 32s | |
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| 4m 32s | |
| 4m 32s | |
| 4m 34s | |
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| 4m 32s | |
| 4m 32s | |
| 4m 28s | |
| 4m 31s | |
| 4m 29s | |
| 4m 30s | |
| 4m 27s | |
| 4m 30s | |
| 4m 29s | |
| 4m 29s | |
| 4m 27s | |
| 4m 30s | |
| 4m 31s | |
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| 4m 30s | |
| 4m 31s | |
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| 4m 31s | |
| 4m 32s | |
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| 4m 31s | |
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| 4m 32s | |
| 4m 32s | |
| 4m 31s | |
| 4h 3m 46s |